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DTC P2758: Torque Converter Clutch Pressure Control Solenoid Control Circuit Stuck On: Notes

WARNING: This page is about a different car, the 2020 Subaru Impreza. However, it is still accessible from the selected car via links, so may be relevant.

1. - 

DTC detecting condition: 

Detected when two consecutive driving cycles with fault occur.

Trouble symptom: 

The engine stalls when the vehicle is stopped.

Wiring diagram: 

CVT control system Ref. to WIRING SYSTEM (IMPREZA MODEL)>CVT CONTROL SYSTEM .

G10276550Courtesy of SUBARU OF AMERICA, INC.
CAUTION:
G13615803Courtesy of SUBARU OF AMERICA, INC.
  1. CHECK DTC  .

    Read the DTC of [Transmission] using the Subaru Select Monitor. Ref. to TRANSMISSION (DIAGNOSTICS) (IMPREZA MODEL)>DIAGNOSTIC TROUBLE CODE (DTC) .

    Is a DTC other than DTC P2758 displayed?

    Yes  : Perform the diagnosis according to DTCs other than P2758. Ref. to TRANSMISSION (DIAGNOSTICS) (IMPREZA MODEL)>DIAGNOSTIC TROUBLE CODE (DTC)>LIST .

    No  : Go to  2.

  2. CHECK LOCK-UP DUTY SOLENOID (ACTIVE TEST)  .
    1. Turn the ignition switch to ON.
    2. Using the Subaru Select Monitor, perform the active test of the lock-up duty solenoid. Ref. to TRANSMISSION (DIAGNOSTICS) (IMPREZA MODEL)>ACTIVE TEST .

    Does the indication of 0 - 50% appear repeatedly during the active test, and does operating sound emit during indicating 50%?

    Yes  : Go to  6.

    No  : Go to  3.

  3. CHECK LOCK-UP DUTY SOLENOID  .
    1. Turn the ignition switch to OFF.
    2. Disconnect the TCM connector.
    3. Measure the resistance between TCM connector and transmission body.

      Connector & terminal 

      (T10) No. 15 - Transmission body:

    Is the resistance approximately 10 - 14.2 Ω? (When cold)

    Yes  : Replace the control valve body. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 IMPREZA)>CONTROL VALVE BODY .

    No  : Go to  4.

  4. CHECK HARNESS  .
    CAUTION: Start work after ATF cools down.
    1. Remove the transmission valve cover.
    2. Disconnect the control valve body connector.
    3. Measure the resistance between TCM connector and control valve body connector.

      Connector & terminal 

      (T10) No. 15 - (T11) No. 9:

    Is the resistance less than 1 Ω?

    Yes  : Go to  5.

    No  : Repair the open circuit of harness.

  5. CHECK HARNESS  .

    Measure the resistance between TCM connector and transmission body.

    Connector & terminal 

    (T10) No. 15 - Control valve body:

    Is the resistance 1 MΩ or more?

    Yes  : Replace the control valve body. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 IMPREZA)>CONTROL VALVE BODY .

    No  : Repair the short circuit of harness.

  6. CHECK TRANSMISSION FLUID  .
    1. Connect all connectors.
    2. Check the amount of ATF. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 IMPREZA)>CVTF>ADJUSTMENT .

    Is the check result OK?

    Yes  : Go to  7.

    No  : Adjust the amount of ATF. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 IMPREZA)>CVTF>ADJUSTMENT .

  7. CHECK TRANSMISSION FLUID  .

    Check the condition of ATF. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 IMPREZA)>CVTF>CONDITION CHECK .

    Is the check result OK?

    Yes  : Go to  8.

    No  : Check according to the "Corrective action" of ATF (CVTF) "CONDITION CHECK". Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 IMPREZA)>CVTF>CONDITION CHECK .

  8. CHECK INPUT SIGNAL FOR TCM  .
    1. Lift up the vehicle.
    2. Start the engine.
    3. Warm up until the ATF temperature reaches to 40 - 70°C (104 - 158°F).
    4. Depress the brake pedal, and shift the select lever to "D" range.
    5. Shift the select lever to "P" range.
    6. Stabilize the engine speed at idle.
    7. Using the Subaru Select Monitor, read data of [Actual Secondary Pressure] in the [Data Monitor] of [Transmission]. Ref. to TRANSMISSION (DIAGNOSTICS) (IMPREZA MODEL)>DATA MONITOR .

    Is [Actual Secondary Pressure] 0.5 - 1.5 [MPa]?

    Yes  : Replace the control valve body. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 IMPREZA)>CONTROL VALVE BODY . Go to  9.

    No  : Perform the diagnosis according to DTC P0841. Ref. to TRANSMISSION (DIAGNOSTICS) (IMPREZA MODEL)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC P0841 TRANSMISSION FLUID PRESSURE SENSOR/SWITCH "A" CIRCUIT RANGE/PERFORMANCE .

  9. DRIVING CHECK FOR LOCK-UP CONDITION  .
    1. Using the Subaru Select Monitor, perform the clear memory of [Transmission]. Ref. to COMMON (DIAG)>CLEAR MEMORY .
    2. Turn the ignition switch to OFF.
    3. Start the engine.
    4. Warm up until the ATF temperature exceeds 50°C.
    5. Drive the vehicle for one minute or more while keeping such constant speed that [Lock Up Duty Ratio] is 0%, and [Front Wheel Speed] is 5 km/h (3 MPH) or less, which are displayed on the Subaru Select Monitor.
    6. Turn the ignition switch to OFF.
    7. Start the engine.
    8. Perform the procedure in step  5 again.
    9. Read the DTC of [Transmission] using the Subaru Select Monitor. Ref. to TRANSMISSION (DIAGNOSTICS) (IMPREZA MODEL)>DIAGNOSTIC TROUBLE CODE (DTC) .

    Does the AT OIL TEMP light blink and is DTC P2758 displayed? Or does the engine stall?

    Yes  : Replace the torque converter assembly. Ref. to CONTINUOUSLY VARIABLE TRANSMISSION (TR580 IMPREZA)>TORQUE CONVERTER ASSEMBLY .

    No  : Current condition is normal. It is possible that temporary poor contact occurs.

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